DES-3550 Layer 2
Fast Ethernet Switch User’s Guide
128
In SNMP v.1 and v.2, user authentication is accomplished using ‘community strings’, which
function like passwords. The remote user SNMP application and the switch SNMP must use
the same community string. SNMP packets from any station that has not been authenticated
are ignored (dropped).
The default community strings for the Switch used for SNMP v.1 and v.2 management access
are:
public
- Allows authorized management stations to retrieve MIB objects.
private
- Allows authorized management stations to retrieve and modify MIB objects.
SNMP v.3 uses a more sophisticated authentication process that is separated into two parts.
The first part is to maintain a list of users and their attributes that are allowed to act as SNMP
managers. The second part describes what each user on that list can do as an SNMP manager.
The Switch allows groups of users to be listed and configured with a shared set of privileges.
The SNMP version may also be set for a listed group of SNMP managers. Thus, you may
create a group of SNMP managers that are allowed to view read-only information or receive
traps using SNMP v.1 while assigning a higher level of security to another group, granting
read/write privileges using SNMP v.3.
Using SNMP v.3 individual users or groups of SNMP managers can be allowed to perform or
be restricted from performing specific SNMP management functions. The functions allowed
or restricted are defined using the Object Identifier (OID) associated with a specific MIB. An
additional layer of security is available for SNMP v.3 in that SNMP messages may be
encrypted.
Traps
Traps are messages that alert network personnel of events that occur on the Switch. The
events can be as serious as a reboot (someone accidentally turned OFF the Switch), or less
serious like a port status change. The Switch generates traps and sends them to the trap
recipient (or network manager). Typical traps include trap messages for Authentication
Failure, Topology Change, and Broadcast\Multicast Storm.
MIBs
Management and counter information are stored by the Switch in the Management
Information Base (MIB). The Switch uses the standard MIB-II Management Information Base
module. Consequently, values for MIB objects can be retrieved from any SNMP-based
network management software. In addition to the standard MIB-II, the Switch also supports
its own proprietary enterprise MIB as an extended Management Information Base. The
proprietary MIB may also be retrieved by specifying the MIB Object Identifier. MIB values
can be either read-only or read-write.
The DES-3550 incorporates a flexible SNMP management for the switching environment.
SNMP management can be customized to suit the needs of the networks and the preferences
of the network administrator. Use the SNMP V3 menus to select the SNMP version used for
specific tasks.
The DES-3550 supports the Simple Network Management Protocol (SNMP) versions 1, 2c,
and 3. The administrator can specify the SNMP version used to monitor and control the
Switch. The three versions of SNMP vary in the level of security provided between the
management station and the network device.
Содержание DES-3550
Страница 1: ...D Link DES 3550 Managed 48 port 10 100Mbps and 2GE ports Layer 2 Ethernet Switch Manual...
Страница 33: ...DES 3550 Layer 2 Fast Ethernet Switch User s Guide 33...
Страница 72: ...DES 3550 Layer 2 Fast Ethernet Switch User s Guide 72 Figure 6 24 Bandwidth Settings and Port Bandwidth Table...
Страница 77: ...DES 3550 Layer 2 Fast Ethernet Switch User s Guide 77 Figure 6 27 Port Security Settings window...
Страница 90: ...DES 3550 Layer 2 Fast Ethernet Switch User s Guide 90 Figure 6 39 Lacp Port Settings and LACP Port Table...
Страница 107: ...DES 3550 Layer 2 Fast Ethernet Switch User s Guide 107 Figure 6 58 802 1X Authenticator Settings window...
Страница 110: ...DES 3550 Layer 2 Fast Ethernet Switch User s Guide 110 Figure 6 60 802 1x Capability Settings and Table window...